[issue41006] Reduce number of modules imported by runpy

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

I close the issue. Making more imports lazy doesn't bring much benefit.

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With the 3 changes, runpy now imports 55 modules, instead of 70.

The startup time is 1.3x faster, 18 ms instead of 24 ms:

Mean +- std dev: [before] 23.7 ms +- 0.4 ms -> [after] 17.8 ms +- 0.6 ms: 1.33x faster (-25%)

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Avoiding itertools and types doesn't bring much benefit:

Mean +- std dev: [after] 17.8 ms +- 0.6 ms -> [WIP] 17.2 ms +- 0.4 ms: 1.03x faster (-3%)

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41006>
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